[people/ms/u-boot.git] / drivers / gpio / altera_pio.c

/*
 * Copyright (C) 2015  Thomas Chou <thomas@wytron.com.tw>
 * Copyright (C) 2011  Missing Link Electronics
 *                     Joachim Foerster <joachim@missinglinkelectronics.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <fdtdec.h>
#include <asm/io.h>
#include <asm/gpio.h>

DECLARE_GLOBAL_DATA_PTR;

struct altera_pio_regs {
	u32	data;			/* Data register */
	u32	direction;		/* Direction register */
};

struct altera_pio_platdata {
	struct altera_pio_regs *regs;
	int gpio_count;
	const char *bank_name;
};

static int altera_pio_direction_input(struct udevice *dev, unsigned pin)
{
	struct altera_pio_platdata *plat = dev_get_platdata(dev);
	struct altera_pio_regs *const regs = plat->regs;

	clrbits_le32(&regs->direction, 1 << pin);

	return 0;
}

static int altera_pio_direction_output(struct udevice *dev, unsigned pin,
				     int val)
{
	struct altera_pio_platdata *plat = dev_get_platdata(dev);
	struct altera_pio_regs *const regs = plat->regs;

	if (val)
		setbits_le32(&regs->data, 1 << pin);
	else
		clrbits_le32(&regs->data, 1 << pin);
	/* change the data first, then the direction. to avoid glitch */
	setbits_le32(&regs->direction, 1 << pin);

	return 0;
}

static int altera_pio_get_value(struct udevice *dev, unsigned pin)
{
	struct altera_pio_platdata *plat = dev_get_platdata(dev);
	struct altera_pio_regs *const regs = plat->regs;

	return readl(&regs->data) & (1 << pin);
}


static int altera_pio_set_value(struct udevice *dev, unsigned pin, int val)
{
	struct altera_pio_platdata *plat = dev_get_platdata(dev);
	struct altera_pio_regs *const regs = plat->regs;

	if (val)
		setbits_le32(&regs->data, 1 << pin);
	else
		clrbits_le32(&regs->data, 1 << pin);

	return 0;
}

static int altera_pio_probe(struct udevice *dev)
{
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct altera_pio_platdata *plat = dev_get_platdata(dev);

	uc_priv->gpio_count = plat->gpio_count;
	uc_priv->bank_name = plat->bank_name;

	return 0;
}

static int altera_pio_ofdata_to_platdata(struct udevice *dev)
{
	struct altera_pio_platdata *plat = dev_get_platdata(dev);

	plat->regs = map_physmem(dev_get_addr(dev),
				 sizeof(struct altera_pio_regs),
				 MAP_NOCACHE);
	plat->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
		"altr,gpio-bank-width", 32);
	plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
		"gpio-bank-name", NULL);

	return 0;
}

static const struct dm_gpio_ops altera_pio_ops = {
	.direction_input	= altera_pio_direction_input,
	.direction_output	= altera_pio_direction_output,
	.get_value		= altera_pio_get_value,
	.set_value		= altera_pio_set_value,
};

static const struct udevice_id altera_pio_ids[] = {
	{ .compatible = "altr,pio-1.0" },
	{ }
};

U_BOOT_DRIVER(altera_pio) = {
	.name		= "altera_pio",
	.id		= UCLASS_GPIO,
	.of_match	= altera_pio_ids,
	.ops		= &altera_pio_ops,
	.ofdata_to_platdata = altera_pio_ofdata_to_platdata,
	.platdata_auto_alloc_size = sizeof(struct altera_pio_platdata),
	.probe		= altera_pio_probe,
};
Commit	Line	Data
03d67e12	1	/*
88d5ecf4	2	* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
03d67e12 JF	3	* Copyright (C) 2011 Missing Link Electronics
	4	* Joachim Foerster <joachim@missinglinkelectronics.com>
	5	*
1a459660	6	* SPDX-License-Identifier: GPL-2.0+
03d67e12 JF	7	*/
03d67e12 JF	8	#include <common.h>
88d5ecf4 TC	9	#include <dm.h>
	10	#include <errno.h>
	11	#include <malloc.h>
	12	#include <fdtdec.h>
03d67e12 JF	13	#include <asm/io.h>
	14	#include <asm/gpio.h>
	15
88d5ecf4	16	DECLARE_GLOBAL_DATA_PTR;
03d67e12	17
88d5ecf4 TC	18	struct altera_pio_regs {
	19	u32 data; /* Data register */
	20	u32 direction; /* Direction register */
	21	};
03d67e12	22
88d5ecf4 TC	23	struct altera_pio_platdata {
	24	struct altera_pio_regs *regs;
	25	int gpio_count;
	26	const char *bank_name;
	27	};
03d67e12	28
88d5ecf4	29	static int altera_pio_direction_input(struct udevice *dev, unsigned pin)
03d67e12	30	{
88d5ecf4 TC	31	struct altera_pio_platdata *plat = dev_get_platdata(dev);
88d5ecf4 TC	32	struct altera_pio_regs *const regs = plat->regs;
03d67e12	33
88d5ecf4	34	clrbits_le32(&regs->direction, 1 << pin);
03d67e12	35
88d5ecf4	36	return 0;
03d67e12 JF	37	}
03d67e12 JF	38
88d5ecf4 TC	39	static int altera_pio_direction_output(struct udevice *dev, unsigned pin,
88d5ecf4 TC	40	int val)
03d67e12	41	{
88d5ecf4 TC	42	struct altera_pio_platdata *plat = dev_get_platdata(dev);
88d5ecf4 TC	43	struct altera_pio_regs *const regs = plat->regs;
03d67e12	44
88d5ecf4 TC	45	if (val)
	46	setbits_le32(&regs->data, 1 << pin);
	47	else
	48	clrbits_le32(&regs->data, 1 << pin);
	49	/* change the data first, then the direction. to avoid glitch */
	50	setbits_le32(&regs->direction, 1 << pin);
03d67e12	51
88d5ecf4	52	return 0;
03d67e12 JF	53	}
03d67e12 JF	54
88d5ecf4	55	static int altera_pio_get_value(struct udevice *dev, unsigned pin)
03d67e12	56	{
88d5ecf4 TC	57	struct altera_pio_platdata *plat = dev_get_platdata(dev);
88d5ecf4 TC	58	struct altera_pio_regs *const regs = plat->regs;
03d67e12	59
88d5ecf4	60	return readl(&regs->data) & (1 << pin);
03d67e12 JF	61	}
	62
	63
88d5ecf4	64	static int altera_pio_set_value(struct udevice *dev, unsigned pin, int val)
03d67e12	65	{
88d5ecf4 TC	66	struct altera_pio_platdata *plat = dev_get_platdata(dev);
88d5ecf4 TC	67	struct altera_pio_regs *const regs = plat->regs;
03d67e12	68
88d5ecf4 TC	69	if (val)
	70	setbits_le32(&regs->data, 1 << pin);
	71	else
	72	clrbits_le32(&regs->data, 1 << pin);
03d67e12	73
03d67e12 JF	74	return 0;
	75	}
	76
88d5ecf4	77	static int altera_pio_probe(struct udevice *dev)
03d67e12	78	{
88d5ecf4 TC	79	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
88d5ecf4 TC	80	struct altera_pio_platdata *plat = dev_get_platdata(dev);
03d67e12	81
88d5ecf4 TC	82	uc_priv->gpio_count = plat->gpio_count;
88d5ecf4 TC	83	uc_priv->bank_name = plat->bank_name;
03d67e12	84
03d67e12 JF	85	return 0;
	86	}
	87
88d5ecf4	88	static int altera_pio_ofdata_to_platdata(struct udevice *dev)
03d67e12	89	{
88d5ecf4	90	struct altera_pio_platdata *plat = dev_get_platdata(dev);
03d67e12	91
079bfc5d TC	92	plat->regs = map_physmem(dev_get_addr(dev),
	93	sizeof(struct altera_pio_regs),
	94	MAP_NOCACHE);
88d5ecf4 TC	95	plat->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
	96	"altr,gpio-bank-width", 32);
	97	plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
	98	"gpio-bank-name", NULL);
03d67e12	99
03d67e12 JF	100	return 0;
	101	}
	102
88d5ecf4 TC	103	static const struct dm_gpio_ops altera_pio_ops = {
	104	.direction_input = altera_pio_direction_input,
	105	.direction_output = altera_pio_direction_output,
	106	.get_value = altera_pio_get_value,
	107	.set_value = altera_pio_set_value,
	108	};
	109
	110	static const struct udevice_id altera_pio_ids[] = {
	111	{ .compatible = "altr,pio-1.0" },
	112	{ }
	113	};
	114
	115	U_BOOT_DRIVER(altera_pio) = {
	116	.name = "altera_pio",
	117	.id = UCLASS_GPIO,
	118	.of_match = altera_pio_ids,
	119	.ops = &altera_pio_ops,
	120	.ofdata_to_platdata = altera_pio_ofdata_to_platdata,
	121	.platdata_auto_alloc_size = sizeof(struct altera_pio_platdata),
	122	.probe = altera_pio_probe,
	123	};